They're identical, but RHEL6 doesn't support -std=c90
https://gcc.gnu.org/onlinedocs/gcc/Standards.html
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#C-Dialect-Options
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
AM_LDFLAGS =
test_compile_pedantic_SOURCES = test-compile-pedantic.c
-test_compile_pedantic_CFLAGS = $(AM_CPPFLAGS) -pedantic -Werror -std=c90
+test_compile_pedantic_CFLAGS = $(AM_CPPFLAGS) -pedantic -Werror -std=c89
test_link_SOURCES = test-link.c
test_link_CFLAGS = -I$(top_srcdir)