[Bug 2120864] Re: table.c fails to compile with C23 with "error: ‘bool’ cannot be used here"

[Hilmar Preusse]

Version 1.3.9 can be compiled using C23.

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https://bugs.launchpad.net/bugs/2120864

Title:
  table.c fails to compile with C23 with "error: ‘bool’ cannot be used
  here"

Status in proftpd-dfsg package in Ubuntu:
  New

Bug description:
  Version 1.3.8.c+dfsg-4

  Log snippet:

  ```
  ...
  601s gcc -Wdate-time -D_FORTIFY_SOURCE=3 -DHAVE_CONFIG_H  -DLINUX  -I.. -I../include -I../include -I/usr/include/mysql -I/usr/include/postgresql -Wdate-time -D_FORTIFY_SOURCE=3 -g2 -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=/usr/src/proftpd-dfsg-1.3.8.c+dfsg-4 -Wall -fno-omit-frame-pointer -fno-strict-aliasing -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c sets.c
  602s gcc -Wdate-time -D_FORTIFY_SOURCE=3 -DHAVE_CONFIG_H  -DLINUX  -I.. -I../include -I../include -I/usr/include/mysql -I/usr/include/postgresql -Wdate-time -D_FORTIFY_SOURCE=3 -g2 -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=/usr/src/proftpd-dfsg-1.3.8.c+dfsg-4 -Wall -fno-omit-frame-pointer -fno-strict-aliasing -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c pool.c
  604s gcc -Wdate-time -D_FORTIFY_SOURCE=3 -DHAVE_CONFIG_H  -DLINUX  -I.. -I../include -I../include -I/usr/include/mysql -I/usr/include/postgresql -Wdate-time -D_FORTIFY_SOURCE=3 -g2 -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=/usr/src/proftpd-dfsg-1.3.8.c+dfsg-4 -Wall -fno-omit-frame-pointer -fno-strict-aliasing -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c privs.c
  605s gcc -Wdate-time -D_FORTIFY_SOURCE=3 -DHAVE_CONFIG_H  -DLINUX  -I.. -I../include -I../include -I/usr/include/mysql -I/usr/include/postgresql -Wdate-time -D_FORTIFY_SOURCE=3 -g2 -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=/usr/src/proftpd-dfsg-1.3.8.c+dfsg-4 -Wall -fno-omit-frame-pointer -fno-strict-aliasing -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c str.c
  607s gcc -Wdate-time -D_FORTIFY_SOURCE=3 -DHAVE_CONFIG_H  -DLINUX  -I.. -I../include -I../include -I/usr/include/mysql -I/usr/include/postgresql -Wdate-time -D_FORTIFY_SOURCE=3 -g2 -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src=/usr/src/proftpd-dfsg-1.3.8.c+dfsg-4 -Wall -fno-omit-frame-pointer -fno-strict-aliasing -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp/autopkgtest.dMSItq/build.V4w/src/src=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c table.c
  608s table.c:1280:31: error: ‘bool’ cannot be used here
  608s  1280 | int table_handling_signal(int bool) {
  608s       |                               ^~~~
  608s table.c:1280:31: note: ‘bool’ is a keyword with ‘-std=c23’ onwards
  608s table.c: In function ‘table_handling_signal’:
  608s table.c:1281:12: error: expected identifier or ‘(’ before ‘==’ token
  608s  1281 |   if (bool == TRUE ||
  608s       |            ^~
  608s table.c:1281:7: error: declaration in the controlling expression must have an initializer
  608s  1281 |   if (bool == TRUE ||
  608s       |       ^~~~
  608s table.c:1283:23: error: expected expression before ‘bool’
  608s  1283 |     handling_signal = bool;
  608s       |                       ^~~~
  608s make[1]: Leaving directory '/tmp/autopkgtest.dMSItq/build.V4w/src/src'
  608s make[1]: *** [Makefile:20: table.o] Error 1
  608s make: *** [Makefile:54: src] Error 2
  ...
  ```

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