[PATCH 2/2] Makefile: Only look for @MARKER@ at the start of a line when generating libgrub_a_init.lst

[Glenn Washburn]

Under certain conditions libgrub.pp gets generated with a such that it
contains a bunch of CPP defines, at least one of which contains "@MARKER@".
This line should not be used when generating libgrub_a_init.lst, otherwise
we get compiler errors like:

  libgrub_a_init.c:22:18: error: stray ‘#’ in program
     22 | extern void grub_#define_init (void);
        |                  ^
  libgrub_a_init.c:22:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘define_init’
     22 | extern void grub_#define_init (void);
        |                   ^~~~~~~~~~~
  libgrub_a_init.c:23:18: error: stray ‘#’ in program
     23 | extern void grub_#define_fini (void);
        |                  ^
  libgrub_a_init.c:23:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘define_fini’
     23 | extern void grub_#define_fini (void);
        |                   ^~~~~~~~~~~
  ...

When generating libgrub_a_init.lst only lines starting with "@MARKER@" are
desired.

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
 Makefile.am | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 10faf670b..81a196cdc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -52,7 +52,7 @@ libgrub.pp: config-util.h grub_script.tab.h grub_script.yy.h 
$(libgrubmods_a_SOU
 CLEANFILES += libgrub.pp
 
 libgrub_a_init.lst: libgrub.pp
-       cat $< | grep '@MARKER@' | sed 's/@MARKER@\(.*\)@/\1/g' | sort -u > $@ 
|| (rm -f $@; exit 1)
+       cat $< | grep '^@MARKER@' | sed 's/@MARKER@\(.*\)@/\1/g' | sort -u > $@ 
|| (rm -f $@; exit 1)
 CLEANFILES += libgrub_a_init.lst
 
 libgrub_a_init.c: libgrub_a_init.lst $(top_srcdir)/geninit.sh
@@ -66,7 +66,7 @@ grub_fstest.pp: $(grub_fstest_SOURCES)
 CLEANFILES += grub_fstest.pp
 
 grub_fstest_init.lst: libgrub.pp grub_fstest.pp
-       cat $^ | grep '@MARKER@' | sed 's/@MARKER@\(.*\)@/\1/g' | sort -u > $@ 
|| (rm -f $@; exit 1)
+       cat $^ | grep '^@MARKER@' | sed 's/@MARKER@\(.*\)@/\1/g' | sort -u > $@ 
|| (rm -f $@; exit 1)
 CLEANFILES += grub_fstest_init.lst
 
 grub_fstest_init.c: grub_fstest_init.lst $(top_srcdir)/geninit.sh
-- 
2.27.0