Main: generate position-independent code by default

Disable with "--disable-pic"

.cirrus.yml

@@ -10,7 +10,7 @@ main_freebsd_task:
     - pkg install --yes autoconf automake
   main_build_script:
     - ./autogen.sh
-    - ./configure --enable-tests CFLAGS='-O3 -fPIC'
+    - ./configure --enable-tests CFLAGS='-O3'
     - make
     - sudo make install
   main_test_script:
@@ -25,7 +25,7 @@ mruby_freebsd_task:
     - unzip mruby-3.0.0.zip
   main_build_script:
     - ./autogen.sh
-    - ./configure CFLAGS='-O3 -fPIC'
+    - ./configure CFLAGS='-O3'
     - make
     - sudo make install
   mruby_test_script:
@@ -45,7 +45,7 @@ ruby_freebsd_task:
     - sudo make install
   main_build_script:
     - ./autogen.sh
-    - ./configure CFLAGS='-O3 -fPIC'
+    - ./configure CFLAGS='-O3'
     - make
     - sudo make install
   ruby_build_script:
@@ -67,7 +67,7 @@ rust_freebsd_task:
     - curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
   main_build_script:
     - ./autogen.sh
-    - ./configure CFLAGS='-O3 -fPIC'
+    - ./configure CFLAGS='-O3'
     - make
     - sudo make install
   rust_test_script:

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure --enable-tests CC='${{matrix.cc}}' CFLAGS='${{matrix.opt}} -fPIC'
+        run: ./configure --enable-tests CC='${{matrix.cc}}' CFLAGS='${{matrix.opt}}'
       - name: make
         run: make
       - name: check
@@ -51,7 +51,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure --enable-tests --without-all CFLAGS='-fPIC'
+        run: ./configure --enable-tests --without-all
       - name: make
         run: make
       - name: check

.github/workflows/mruby.yml

@@ -18,7 +18,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure CFLAGS='-O3 -fPIC'
+        run: ./configure CFLAGS='-O3'
       - name: make
         run: make
       - name: install

.github/workflows/ruby.yml

@@ -19,7 +19,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure CFLAGS='-O3 -fPIC'
+        run: ./configure CFLAGS='-O3'
       - name: make
         run: make
       - name: install
@@ -51,7 +51,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure --without-all CFLAGS='-O3 -fPIC'
+        run: ./configure --without-all CFLAGS='-O3'
       - name: make
         run: make
       - name: install

.github/workflows/rust.yml

@@ -18,7 +18,7 @@ jobs:
       - name: autogen
         run: ./autogen.sh
       - name: configure
-        run: ./configure CFLAGS='-O3 -fPIC'
+        run: ./configure CFLAGS='-O3'
       - name: make
         run: make
       - name: install

ChangeLog

@@ -1,3 +1,8 @@
+2022-02-02  Alex Kotov  <kotovalexarian@gmail.com>
+
+	* configure.ac: Generate position-independent code by default, disable with
+	"--disable-pic"
+
 2022-02-01  Alex Kotov  <kotovalexarian@gmail.com>
 
 	* configure.ac: Generate headers conditionally depending on options

Makefile.am

@@ -17,14 +17,6 @@ libkernaux_a_SOURCES = \
 	src/assert.c \
 	src/libc.c
 
-if ENABLE_TESTS
-TESTS = \
-	examples/assert_guards \
-	examples/assert_simple \
-	examples/panic_guards \
-	examples/panic_simple
-endif
-
 if ASM_I386
 libkernaux_a_SOURCES += src/asm/i386.S
 endif
@@ -37,6 +29,14 @@ if ASM_X86_64
 libkernaux_a_SOURCES += src/asm/x86_64.S
 endif
 
+if ENABLE_TESTS
+TESTS = \
+	examples/assert_guards \
+	examples/assert_simple \
+	examples/panic_guards \
+	examples/panic_simple
+endif
+
 if WITH_CMDLINE
 libkernaux_a_SOURCES += src/cmdline.c
 if ENABLE_TESTS

README.md

@@ -103,6 +103,7 @@ stable options.
 
 * `--enable-bloat`, disable with `--disable-bloat`
 * `--enable-float`, disable with `--disable-float`
+* `--enable-pic`, disable with `--disable-pic`
 
 #### Packages
 
@@ -121,7 +122,7 @@ Tips
 
 ```
 ./autogen.sh
-./configure CFLAGS='-fPIC'
+./configure
 make
 sudo make install
 ```
@@ -133,7 +134,7 @@ environment.
 
 ```
 ./autogen.sh
-./configure --enable-tests CFLAGS='-fPIC'
+./configure --enable-tests
 make
 ```
 
@@ -150,6 +151,7 @@ without it in `$PATH`:
 ```
 ./configure \
   --host='i386-elf' \
+  --disable-pic \
   --with-libc \
   AR="$(which i386-elf-ar)" \
   CC="$(which i386-elf-gcc)" \

config/dev-cross-i386

@@ -14,6 +14,6 @@ export     AR="$CROSS-ar"
 export     CC="$CROSS-gcc"
 export RANLIB="$CROSS-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/dev-cross-riscv64

@@ -14,6 +14,6 @@ export     AR="$CROSS-ar"
 export     CC="$CROSS-gcc"
 export RANLIB="$CROSS-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/dev-cross-x86_64

@@ -14,6 +14,6 @@ export     AR="$CROSS-ar"
 export     CC="$CROSS-gcc"
 export RANLIB="$CROSS-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic -mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/dev-native

@@ -7,6 +7,4 @@ if [ -f "$REPO/Makefile" ]; then make -C "$REPO" distclean; fi
 
 PREFIX="$REPO/dest/dev-native"
 
-export CFLAGS='-fPIC'
-
 "$REPO/configure" --prefix="$PREFIX" --enable-tests

config/root-cross-i386-linux

@@ -14,6 +14,6 @@ export     AR="$TARGET-ar"
 export     CC="$TARGET-gcc"
 export RANLIB="$TARGET-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/root-cross-riscv64-linux

@@ -14,6 +14,6 @@ export     AR="$TARGET-ar"
 export     CC="$TARGET-gcc"
 export RANLIB="$TARGET-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/root-cross-x86_64-linux

@@ -14,6 +14,6 @@ export     AR="$TARGET-ar"
 export     CC="$TARGET-gcc"
 export RANLIB="$TARGET-ranlib"
 
-export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -fno-pic -mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
+export CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector -mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --disable-pic --with-libc

config/root-native

@@ -5,6 +5,4 @@ set -e
 REPO="$(realpath "$(dirname "$(realpath "$0")")/..")"
 if [ -f "$REPO/Makefile" ]; then make -C "$REPO" distclean; fi
 
-export CFLAGS='-fPIC'
-
 "$REPO/configure" --enable-tests

configure.ac

@@ -16,6 +16,7 @@ AC_CANONICAL_HOST
 dnl Features (enabled by default)
 AC_ARG_ENABLE([bloat],        AS_HELP_STRING([--disable-bloat],       [disable unnecessary heavy binary data]))
 AC_ARG_ENABLE([float],        AS_HELP_STRING([--disable-float],       [disable floating-point arithmeric]))
+AC_ARG_ENABLE([pic],          AS_HELP_STRING([--disable-pic],         [do not generate position-independent code]))
 
 dnl Features (disabled by default)
 AC_ARG_ENABLE([tests],        AS_HELP_STRING([--enable-tests],        [enable tests and examples]))
@@ -89,6 +90,7 @@ AM_CONDITIONAL([ASM_X86_64],        [test "$host_cpu" = x86_64])
 dnl Features (enabled by default)
 AM_CONDITIONAL([ENABLE_BLOAT],      [test "$enable_bloat"      != no])
 AM_CONDITIONAL([ENABLE_FLOAT],      [test "$enable_float"      != no])
+AM_CONDITIONAL([ENABLE_PIC],        [test "$enable_pic"        != no])
 
 dnl Features (disabled by default)
 AM_CONDITIONAL([ENABLE_TESTS],      [test "$enable_tests"      = yes])
@@ -124,6 +126,7 @@ AS_IF([test "$host_cpu" = x86_64],        [AC_DEFINE([ASM_X86_64],           [1]
 dnl Features (enabled by default)
 AS_IF([test "$enable_bloat"      != no], [AC_DEFINE([ENABLE_BLOAT],          [1], [enabled unnecessary heavy binary data])])
 AS_IF([test "$enable_float"      != no], [AC_DEFINE([ENABLE_FLOAT],          [1], [enabled floating-point arithmeric])])
+AS_IF([test "$enable_pic"        != no], [AC_DEFINE([ENABLE_PIC],            [1], [generate position-independent code])])
 
 dnl Features (disabled by default)
 AS_IF([test "$enable_tests"      = yes], [AC_DEFINE([ENABLE_TESTS],          [1], [enabled tests and examples])])
@@ -179,6 +182,10 @@ AS_IF([test "$with_libc_strnlen" != yes], [AC_SUBST([comment_line_libc_strnlen],
 
 
 
+AS_IF([test "$enable_pic" != no], [CFLAGS+=' -fpic '], [CFLAGS+=' -fno-pic'])
+
+
+
 AM_INIT_AUTOMAKE([1.9 subdir-objects])
 
 AC_CONFIG_FILES([