Avoid redefining _GNU_SOURCE #30
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It's harmless, but with 3dea342, we get: ``` x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I/var/tmp/portage/sys-fs/libeatmydata-131/work/libeatmydata-131 -O2 -pipe -march=native -fdiagnostics-color=always -frecord-gcc-switches -Wreturn-type -ggdb3 -Werror=implicit-function-declaration -Werror=implicit-int -c -o libeatmydata/test/tst-cancel4.o /var/tmp/portage/sys-fs/libeatmydata-131/work/libeatmydata-131/libeatmydata/test/tst-cancel4.c /var/tmp/portage/sys-fs/libeatmydata-131/work/libeatmydata-131/libeatmydata/test/tst-cancel4.c:28: warning: "_GNU_SOURCE" redefined 28 | #define _GNU_SOURCE | In file included from /var/tmp/portage/sys-fs/libeatmydata-131/work/libeatmydata-131/libeatmydata/test/tst-cancel4.c:26: ./config.h:115: note: this is the location of the previous definition 115 | # define _GNU_SOURCE 1 | ``` This is because we already have `AC_USE_SYSTEM_EXTENSIONS` in configure.ac which sets GNU_SOURCE in config.h for us. We also explicitly add a config.h include to tst-invalidvd.c instead of relying on it via portability.h.
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It's harmless, but with 3dea342, we get:
This is because we already have
AC_USE_SYSTEM_EXTENSIONSin configure.ac which sets GNU_SOURCE in config.h for us.We also explicitly add a config.h include to tst-invalidvd.c instead of relying on it via portability.h.