grover@sed170.hac.com (Dean Grover) (11/06/89)
While looking in /usr/include/vfork.h under SunOS 4.0.3, I noticed the following line: #pragma unknown_control_flow(vfork) I can guess what that means to the C compiler, but my question is, where is the #pragma compiler directive documented ? I haven't been able to find it anywhere. Also, besides "unknown_control_flow", what other options exist ? Thanks in advance, Dean Grover Hughes Aircraft Co. grover@sed170.hac.com or adgrover@hac2arpa.hac.com
net%TUB.BITNET@mitvma.mit.edu (Oliver Laumann) (11/13/89)
In article <2860@brazos.Rice.edu> you write: > While looking in /usr/include/vfork.h under SunOS 4.0.3, I noticed the > following line: > #pragma unknown_control_flow(vfork) > > Also, besides "unknown_control_flow", what other options exist ? With the help of "strings /lib/ccom" I figured out that there is a second pragma option named "makes_regs_inconsistent". Like "unknown_control_flow", it accepts one or more function names as arguments. Regards. Oliver Laumann net@TUB.BITNET net@tub.UUCP
tim@ucbvax.berkeley.edu (Tim Wood) (11/16/89)
In article <2860@brazos.Rice.edu> grover@sed170.hac.com (Dean Grover) writes: >X-Sun-Spots-Digest: Volume 8, Issue 189, message 7 of 22 > >I can guess what [#pragma] means to the C compiler, but my question is, >where is the #pragma compiler directive documented ? Try _The C Programming Language_, 2nd Ed., by Kernighan and Ritchie, p. 233. "#pragma" tells the preprocessor to perform "an implementation-dependent action." Looks like a roll-your-own-preprocessor hook....
bob@morningstar.com (Bob Sutterfield) (11/17/89)
In article <2860@brazos.Rice.edu> grover@sed170.hac.com (Dean Grover) writes: | While looking in /usr/include/vfork.h under SunOS 4.0.3, I noticed | the following line: | | #pragma unknown_control_flow(vfork) | | I can guess what that means to the C compiler, but my question is, | where is the #pragma compiler directive documented ? I haven't | been able to find it anywhere. It's an ANSIism. See K&R II, appendix A 12.8, concerning the preprocessor. Also, besides "unknown_control_flow", what other options exist ? It's implementation-dependent. Ask your compiler author. Oddly enough, #pragma isn't in the SunOS 4.0.3 cc(1), cpp(1), or m4(1V) pages, nor in the hardcopy _C_Programmer's_Guide_.